To validate the HJ-1A HSI red edge indices，spectral reflectance data from EO-1 Hyperion of close date were used to simulate the band reflectance of HJ-1A HSI．Four red edge indices(red vale position，red edge position，red edge slop and red edge swing)were extracted from both simulated and actual HJ-1A HSI band reflectance．Comparisons of the 4 red edge indices between simulated and actual HJ-1A HSl were made to validate the red edge indices product of HJ-1A HSL The average correlation coefficient of red edge reflectance between actual and simulated HJ-1A HSI is 0.946 and its standard deviation is 0.011，thus a high consistency could be found．The correlation coefficients of red edge indices between simulated and actual HJ-1A HSl were 0.414，0.543，0.808 and 0.802 for red edge position，red vale position，the red edge swing and red edge slop respectively． An obvious regular varying trend was found for these 4 red edge indices along different vegetation cover fraction．The standard deviations of differential images between real and simulated HJ-1A HSI red edge indices are 5.75，1.86，5.7 e-4and 0.024．The result showed that the red edge indices from HJ-1A HSI is consistent with that from simulated indices from Hyperion；the vegetation variation could be effectively reflected in HJ-1 A HSI red edge indices．